Dehydration happens when your body gets rid of more fluids, usually through sweating or going to the bathroom more than normal, than it absorbs. Drinking too little water during exercise, hot weather, or daily activities can also cause the body to use up its stored water.
Nocturia is defined as the excessive need to get up and urinate during the night. 1  You may find yourself using the bathroom several times per night and this can be disruptive to your sleep. It is generally considered to be abnormal to wake to urinate when it occurs more than once at night.
Both hypothyroidism and perimenopause may cause sleep problems. The typical kind of sleep disturbance for a perimenopausal woman is mid-sleep wakening. She often will fall asleep instantly and sleep soundly for a few hours only to jolt awake in the wee hours of the morning. Then it is difficult to get back to sleep.