How do i keep myself from clenching my teeth in my sleep?

Relaxation technique: First, try to do some type of relaxation prior to going to bed as night time teeth clenching is often(but not always) a subconscious release of daily tension and stress). Try not to do work, or read an intense story or even watch the news before going to bed because that additional stress can set off your clenching episodes. Also, see a dentist for a custom made mouth guard

Bruxism.: You cannot control the clenching and grinding your teeth at night. The only thing you can do is get a night guard to protect the teeth while grind all night long.