In addition to above the following trick was important to sleep much earlier than I used to. The idea is to lay on the back with arms along the body as relaxed

In addition to above the following trick was important to sleep much earlier than I used to. The idea is to lay on the back with arms along the body as relaxed as possible. Then one rolls eyes and relax jaw to the point when mouse opens slightly. The reason behind this is that when one sleeps, eyes roll and mouse opens. So if one do that when awake, that gives brain a signal to sleep. For me it works most of the time.