If by any chance you wake up in the middle of the night and you stay up for an hour or more, in the morning you will feel tired.
This is not something new – it actually happened to our ancestors. If this occurs often then it means you are supposed to wake up. We slept for four hours and then we are awake for one or two and after that we can sleep again for four hours. This is a biological clock that we often ignore it.
People in the past when awake in the middle of the night used to pray, write, drink some tea or relax. The brain produces prolactin and this hormone promotes relaxation. This waking up process is a normal human physiology. If people who wake up at night are anxious, can’t sleep need this hour or two to relax and be stress free. So don’t panic when you wake up in the middle of the night.
The body is just doing what it needs to do naturally. You don’t need to worry if there is a problem. This has been stated by a neuroscience circadian professor at the Oxford University, Mr. Greg Jacobs.