Research raises questions about the importance of sleeping through the night, reports Psychology Today.

In my experience, people who report waking up in the middle of the night most commonly do so around 3 a.m. This alone may not be very significant, but many people with insomnia say that they have a hard time falling back asleep. We usually attribute this to being an awakening that occurs after the deep sleep of the night has ended and the time of increasing dream sleep has started. At the end of a sleep cycle we are almost awake and it may not take much, even a full bladder or a sound, to fully wake us.