Exhausted

For the past week or so I've been absolutely exhausted. I don't know if it's the T25 we're doing or if I'm just not sleeping well. I'm thinking it may be a combination of both. All I know is that I have no problem taking a nap during the day as well as sleeping at night. Although, some nights I'm almost too exhausted to sleep. Not sure if that's normal or not. Hopefully I will regain my energy soon.