Is it normal to have twitching at night during pms, its causing me to lose sleep?

Sleep twitching. Twitching, or myoclonus, can happen to many people during sleep -- it's not necessarily a feature of pms. Usually the twitches are most intense just as you're dropping off to sleep, but they can occur at other times also. Some drugs can make it worse; if really bothersome it can be a subtle sign of certain neurological problems. If concerned, see your physician and maybe also get a sleep study.