I've never slept well, and in the last five years or so I go off to sleep without any trouble, and can wake up in an hour, two, three or more and be awake for the rest of the night. On very rare occasions, maybe once in three months, I will sleep for 6 hours, never more.
However, now I have a supply of melatonin I usually go back to sleep after a short time, and last night, I had 7 hours sleep and was only awake occasionally.
Lack of sleep has a terrible effect on one's life - I used to dread having to go to work after a really bad night. Now that I am retired I am able to have a nap if I'm overtired.