Dreams

[MTK]

If you do some little "reality checks" throughout the day when you're awake, you can train yourself to do it when you're sleeping. Once you realize you're dreaming, it's pretty crazy.

What works for me is checking the time on a clock or watch. During the day whenever you look at a clock, just ask yourself if you're dreaming. In a dream when you look at the time, look away, and then look back, chances are the time will be different or the numbers will be all out of order.