Does this happen to anyone else?

I've noticed when I get tired I start to rock, or my legs get very twitchy and spasm. It doesn't always happen but sometimes my whole body flails and both make it impossible to sleep, even with my sleep medication, and i cant even sit/lay comfortably, sometimes it feels like a seizure. Sometimes my jaw will just start trembling. Any one else get this or have advice on how to stop or treat it? Is it TD? Restless leg syndrome? Normal side effect? I take cogentin for side effects from my meds and I'm taking pretty a high dose of it 3 times a day.