Lazy?

Ladies I need your opinions on this. 
I'm a student (full time) and I work 30 hours a week. As soon as I come home from work and school, I immediately climb into bed and just lay there until I am ready to sleep. I play on my phone or close my eyes but I don't do anything at all. 
I want to work out or clean but I have no motivation, I'm just so tired and I don't ever feel like moving. 
Any advice? I used to be very active but work and school are wearing me out. I hate being so lazy!