Periods of extreme exhaustion and increased body heat?

What can be the cause of this? Every once in awhile I go weeks where no matter how much I sleep I feel like I've been up for days and have difficulty staying up. I'm also always hot during this time and sweat even when I'm under the A\C. This has been going on and off for years now and it's really hindering my life. I make plans and get plenty of sleep but I end up sleeping through stuff. I really wish for a remedy for this.