Yes. For proper rest of the brain, a paradoxical stage of sleep is required, which usually lasts only a few minutes. That is, it is important to fall asleep soundly. This is quite possible in two hours or even an hour.
But, of course, it is better to leave 3-7 hours a day for sleep, because not only the brain, but the whole body needs rest.
If you know how to relax and fall asleep right away, it makes sense. Two hours is a quarter of the 8 hour norm. Look at how the dog is resting: there are a few minutes, it literally sleeps, it has enough to run again. Learn to completely relax very good not easy, but very good useful.
This definitely makes sense . A little rest is better than no rest at all. Yes, after such a short sleep, you are unlikely to be as effective all day as after a normal sleep, but you will feel a little better than if you had not slept at all.
You probably know about the phases of REM and slow sleep that our body goes through during a night's rest. Here is what happens to the body in each phase:
• slow sleep begins immediately after falling asleep and lasts about one and a half hours. In this phase, the regeneration of body tissues occurs, the muscles completely relax, and blood pressure decreases. There is a physiological rest of the body, as well as structuring of memory - all the information received is laid out in long-term memory.
• REM sleep. This phase takes only about 15 minutes. Brain activity rises to about the same state as during wakefulness. It also increases blood pressure and increases blood flow to the brain. It is during this phase that we dream. This is evidenced by the movements of the pupils, which are visible behind closed eyelids.
In two hours, the body will have time to go through one cycle of "slow sleep-REM sleep". By the way, waking up in REM sleep is noticeable easier, so that after only two hours of sleep, you have every chance of feeling rested and refreshed.