At 17 weeks pregnant, you’re in the early-to-mid second trimester, and sleep is getting noticeably harder. Your baby is roughly 5 inches long and weighs somewhere between 4 and 7 ounces, which means your uterus is expanding enough to start pressing on surrounding organs and blood vessels. The good news: this is a manageable stage, and a few targeted adjustments to your sleep setup can make a real difference.
Why Sleep Gets Harder Around 17 Weeks
The second trimester brings a different set of sleep disruptors than the nausea and constant bathroom trips of the first trimester. At this stage, the most common culprits are heartburn, leg cramps or tingling, shortness of breath, and early fetal movements. Your growing uterus is also shifting your center of gravity, which can make your usual sleeping position feel suddenly uncomfortable.
Pregnancy rhinitis, a type of nasal congestion caused by increased blood flow and hormonal changes, also peaks during this period. If you’ve noticed you’re more stuffed up at night, that’s a normal (if annoying) part of the process. It can fragment your sleep by forcing you to breathe through your mouth or wake up feeling like you can’t get enough air.
The Best Sleeping Position
Side sleeping is the recommended position during pregnancy. The left side is particularly beneficial because it allows the most blood flow to the baby and improves kidney function, which helps your body process fluids and reduce swelling. That said, you don’t need to stress about staying on your left side all night. An NIH-funded study found that sleeping on the right side or back through 30 weeks of pregnancy did not increase the risk of stillbirth, reduced fetal growth, or high blood pressure disorders compared to left-side sleeping.
This is genuinely reassuring if you’re someone who tosses and turns. At 17 weeks, both sides are safe, and you can alternate throughout the night. The key is getting comfortable enough to actually fall asleep and stay asleep.
Why Back Sleeping Becomes a Problem
As your uterus grows, lying flat on your back can compress a major vein called the inferior vena cava, which carries blood from your lower body back to your heart. This is called supine hypotensive syndrome, and it affects up to 8% of women in the second and third trimesters. Symptoms can appear within 3 to 10 minutes of lying down and include dizziness, nausea, sweating, a racing heart, and low blood pressure. In rare cases, it can cause fainting.
The risk is higher with twins or a higher BMI. The simple fix is rolling onto your side, which resolves symptoms quickly. At 17 weeks, this isn’t a crisis-level concern for most women, but it’s a good time to start building the habit of side sleeping before your uterus gets significantly heavier.
How to Set Up Your Pillows
Pillow placement matters more than most people realize. When you’re lying on your side, the goal is keeping your spine in a neutral position so nothing is pulling or twisting. Here’s how to do it:
- Between your knees, thighs, and feet: Place a pillow (or pillows) so your upper leg is level with your pelvis, mirroring the position of the bottom leg. This keeps your hips aligned and takes pressure off your lower back.
- Under your abdomen: A small rolled towel or thin pillow under your belly supports your growing uterus and prevents it from pulling your spine forward.
- Along your back: If you tend to roll onto your back during the night, a firm pillow wedged behind you can act as a gentle barrier.
- Between your ribs and hips: If you feel a gap at your waist when lying on your side, a rolled towel here supports the curve of your spine.
A full-length pregnancy pillow can replace several of these individual pillows, but regular bed pillows work just as well if you position them deliberately. The point is filling the gaps so your body isn’t working to hold itself in alignment while you sleep.
Dealing With Heartburn at Night
Heartburn is one of the most common second-trimester sleep disruptors. Elevating your upper body helps prevent stomach acid from traveling up your esophagus while you’re lying down. A wedge-shaped pillow angled at about 20 degrees (roughly 8 inches of elevation) is a well-studied approach. You can also place blocks or risers under the legs at the head of your bed to achieve a similar slope. Propping yourself up with regular pillows tends to be less effective because you can slide down during the night, but it’s better than lying flat.
Eating your last meal at least two to three hours before bed and avoiding spicy or acidic foods in the evening also helps. Small, frequent meals throughout the day put less pressure on your stomach than large ones.
Managing Leg Cramps
Sudden, painful leg cramps, especially in the calves, are a hallmark of mid-pregnancy sleep disruption. When a cramp strikes, flexing your foot upward (pulling your toes toward your shin) is the most effective immediate response. Gentle stretching, massage, and heat can also help relieve the spasm.
For prevention, the evidence on supplements is surprisingly weak. Studies on magnesium for pregnancy leg cramps have shown inconsistent results for both cramp frequency and pain intensity. Calcium supplements have similarly uncertain benefits based on very small studies. Staying well hydrated during the day and doing gentle calf stretches before bed are your most reliable preventive tools, even though they haven’t been formally tested in clinical trials. They’re low-risk and widely recommended as a first-line approach.
Reducing Nighttime Bathroom Trips
Frequent urination was likely a problem in your first trimester, and while it often eases in the second trimester, it doesn’t disappear entirely. Your uterus is still sitting on your bladder, and your kidneys are processing a higher volume of blood than usual.
The most practical strategy is front-loading your fluid intake. Drink plenty of water during the morning and afternoon, then taper off after dinner. You still need to stay well hydrated, so don’t cut fluids drastically. Just shift the timing so your bladder isn’t filling up right as you’re trying to sleep. When you do get up, keep the lights as dim as possible to avoid signaling your brain that it’s time to wake up.
Clearing Nasal Congestion
If pregnancy congestion is making it hard to breathe at night, saline nasal rinses with a neti pot or squeeze bottle are a safe and effective first step. Sleeping slightly propped up, even just a few extra inches of elevation, can also reduce the feeling of stuffiness. Corticosteroid nasal sprays like Flonase and Nasacort are generally considered safe during pregnancy and can provide more sustained relief. Decongestant sprays work quickly but shouldn’t be used for more than a few days, as they can cause rebound congestion that’s worse than the original problem.
Staying hydrated throughout the day helps thin mucus and keep your nasal passages from drying out, which compounds the congestion problem at night.
Building a Sleep Routine That Works
Beyond positioning and symptom management, basic sleep hygiene becomes more important during pregnancy because your margin for error is smaller. A consistent bedtime helps regulate your body’s internal clock. Keeping your bedroom cool is especially helpful since pregnancy raises your baseline body temperature. Screen time in the hour before bed suppresses the sleep hormone your brain releases in response to darkness, so switching to a book or podcast can make a measurable difference in how quickly you fall asleep.
If you wake up in the middle of the night and can’t fall back asleep within 15 to 20 minutes, get up and do something quiet in low light rather than lying in bed getting frustrated. The goal is to keep your brain associating your bed with sleep, not with the anxiety of trying to sleep. At 17 weeks, you still have months of changing sleep ahead of you, so building these habits now pays off as your belly grows and sleep becomes even more of a challenge.