One cannot "try" and sleep because sleep is the absence of the conscious subjective experience. We must simply focus on feeling tired.
As one enters sleep, the mind deforms. Since it's a Quantum Mechanical projection, its transitions tend to be more "switch-like" in the following manner:
The conscious stream (Ψ) is like a liquid in a clear tub. The tub is the "lens" through which we view the world (no wonder Master calls us "myopic"!).
When awake, the tub does not change shape much. If it did, (if
When awake, there is no greater supposition to validate than the existence of a continuous self (or ego). For a great majority of us, that means that Ψ's projection onto itself predominantly functions to espouse this hypothesis.
The consciousness is thus projected by the mind as a survival mechanism. However, experiment has shown that constant wakefulness causes insanity. Thus the temporary inhibition of consciousness (bestowed by sleep) is also a survival instinct. In sleep, the existence hypothesis is no longer primary. We get a "break" from being "ourselves".
Many people complain to me that they have trouble sleeping. Difficulty sleeping is one of the ways your body communicates that something is wrong. There are probably more things that cause sleep problems than don't. They are unique to each person.
People will say "I was trying to sleep". I believe there is some subliminal programming involved in this sentence. Since thoughts usually collapse to "sentence sized" chunks (so that the mind can understand them), "trying" and "sleeping" become convolved and the afflicted ends up "trying" rather than "sleeping"! By taking a deeper look at the mind, we will see how this practice is counterproductive since it roots the mind in the conscious state.
your "self" changed hugely from one moment to the next with no discernable cause), this would be interpreted by Ψ as a violation of the primary ego hypothesis (causing shock and thereby something the body seeks to minimize the effect of).
That is: Ψ seeks to validate that:
(there exists a Ψ)
When falling asleep (successfully), the consciousness must drain from the tub of wakefulness into another. This one will be larger, darker, more diffuse and (hopefully) smoother than the conscious one.
Sleep is tricky because "Deep sleep" does not always mean one will be well-rested. If the "deep sleep" state is not decoupled from the ego, this will continue to project all night. Since the observables of Ψ are restricted to Ψ, sleep fails to provide the full benefit of what was intended by nature.