Relaxation is a technique of mobilization of attention in a particular direction: relaxation.

This is a mental work that is not compatible with sleep as such, for a bad sleeper, relaxation is interesting in practice, out of bed preferably, as an alternative to the desire to sleep and to control its arousing systems.

A good sleeper "which sets confidence" can use these methods until the "silent thief" comes to steal his thoughts and "already he sleeps ...."