sleep help!!!

I'm so so sick of only getting 6 hours of sleep. No matter what time I go to bed, whether it's 9 pm or 11 I will only get 6 hours, almost to the minute, of sleep. This is a recent development in the past few months and I'm over it. I don't drink caffeine except for tea in the mornings and I exercise rigorously 6 days a week. I'm exhausted when I lay down and I'm exhausted when I wake up. Any advice!?? I'm desperate.