(Help!) How do I get motivation to start studying??

I seriously have no motivation. I feel tired all day and want to stay in bed and watch movies. I don’t even do anything and I’m so tired for no reason. It’s not that I seriously don’t want to study, because I really really do but I have absolutely NO motivation. If I even get myself to study, I loose that energy and it takes me months to get it back. Please I seriously need advice because I’m never going to get my GED if I continue like this and it makes me feel so worthless and depressed. I hate not doing anything all day, every fucking day. I want to wake up and look forward to doing something and look forward to getting something DONE. At the end of the day I want to know that I got stuff done that was needed. I feel like I’m stuck in this cycle where I wake up, and stay in bed all day. And then I have this random motivation at night that I never feel in the day.