Our biological clocks determine what kind of day we're going to have.
We've all had "one of those days" where sleep just seemed far more important than Avogadro's number and how it relates to an atom. But seriously, you don't wanna be that guy.
Don't be that guy
But, then again, at least you didn't fall asleep on the bus on the way to your first day of second grade.
THAT sucks.
While you were busy catching some sleep on the bus on the way to elementary school, your brain was busy conjuring up some pretty awesome dreams. While many dreams have a hidden meaning, some are also very straightforward.
A dream of a flat tire could mean you're anxious about losing status at your job.
OR

A dream of a candy store could simply mean you really love candy. Or that you're stuck in the dream on the bus on your way to second grade...your pick.
There are also a number of other ways to experience an alteration of consciousness.
A daily example of deja vu in our lives.
Many hypnotists use a hypnosis circle.
A daily example of deja vu in our lives.
A much less safe option for altering your consciousness is using illegal narcotics. Remember those pictures from middle school that our health teacher tried to scare us into not using drugs with?
Ew.
While some ways of altering your consciousness are safer than others, it's ultimately up to you!