Pregnancy sleep problem: Frequent urination interferes with your sleep

Why it happens

Shortly after you become pregnant, you may find yourself hurrying to the bathroom more often than usual. Why do you suddenly need to go all the time? Mostly because the amount of blood in your body increases dramatically when you get pregnant. This leads to a lot of extra fluid getting processed through your kidneys and ending up in your bladder.
You may also have to pee more often during the night, especially if you have a lot of swelling in your lower limbs and feet. When you lie down, your legs are level with your upper body. This makes it easier for your blood to carry some of the fluid you retained during the day to your bladder – now that it doesn't have to work against gravity.
Another big factor: At some point your growing uterus may start pressing on your bladder, which can make you feel like you need to pee even more often. This symptom will probably continue or even get worse throughout your pregnancy.

What you can do about it

These tips may help:

• Cut down on nighttime trips to the bathroom by drinking plenty of fluids during the day but limiting your intake in the hours before you go to bed.
• Avoid coffee and tea late in the day is also a good idea.
• When you pee, lean forward to empty your bladder more completely.

You may not be able to get much relief, though. As one mom we know puts it, "It's nature's cruel way of training you for the many nights of interrupted sleep once your baby arrives!"

Sources from here