Studying is a pain

I never knew how much studying hurts until laying down after an hour of sitting in my bed studying. I sit with my book propped up on my bent knees. This causes my legs to ache. My ankles hurt along with my knees and hips. My lower back has a lot of pressure even though I lean against a pillow and this causes my sciatic nerve to act up and tingle and cause sharp pain. My mid back has muscle aches from being hunched over. My neck is tight and is getting a crick in it from looking down for so long. I have a headache stemming from my occipital nerves from focusing my eyes so much. My wrist, hand, and fingers hurt from writing. And then you have my brain. It's fried and I still have more to learn.