I have no energy during the day at all. I feel incredibly tired/drained. But around midnight I get this surge of energy and I'm completely alert. I really want to have energy during the day. But how?

Sometimes, this lack of energy can happen if you don't have a regular sleeping cycle. Do you wake up and go to sleep around the same times every day? By not having a regular pattern, you throw your circadian rhythm out of schedule, which can affect your alertness throughout the day. If you have a good sleeping schedule and still feel the same imbalance in alertness, I would recommend incorporating physical activity in the morning. For the past few months, I would wake up around 6 in the morning to run or do a workout, then afterwards shower and take some time to self-reflect before my classes start in the late morning/early afternoon. Physical activity not only boosts your energy, but also helps with other things such as heart health and mood. In addition, incorporating healthy food in you diet and avoiding fat and sugar-loaded foods before bed can help with your issue. Another thing to be on the lookout for is when you consume caffeine, if you regularly do.

It sounds like you may have upset your sleep cycle. To fix this, stay up all day and do not take a nap. When bedtime comes take a hot bath or shower to help your body relax. Get into comfortable sleep clothing and get in bed immediately afterwards. Make sure that the room is dark, the TV is off, and you are not on your phone. Simply rest in your bed with the goal of going to sleep. Do this every day and night until you solve the problem, repeating as needed. If this doesn't fix the problem then you may want to talk to your doctor about depression and anxiety. Both can cause these types of problems.

This has happened to me too many times. You could do what I used to do to reset my sleeping rythms. Basically, stay up for at least one day and a few hours more, even if you feel tired and sleepy during the day, and when it's finally night time, around the hour in which you would like to sleep, you sleep. Also, no cellphones, no tv's or food 2hrs before it is your time to seep. Get yourself used to having no distrations about an hour before bed time. Hope these advises be of help! And have a good night sleep!