During my part-time studies (I had a 70-80% employment at that time) the time I really started studying productively was after 9-10pm when everyone around me went to finish their day and the world around me started to go silent and night is coming in. Thinking of it today, I don't know how I would have survived that time without the huge support from my wife back then. So all the credits of me being able to complete my studies go to her!
Nowadays, I would not know how I would get through the day-to-day work without medication most days. That often worries me a little.