it's unhealthy

i've been surviving on an average of 4 hours of sleep per day for this entire week. and it's definitely the most productive week i've ever had. up to date. im serious. it was just wake up => study all the way => sleep really late (around 3 am?). i do slack somewhere along the way but i finish my work(most of the time)

but it's really worrying me quite a bit because i'll drink coffee early in the morning to ensure that i do not feel sleepy later in the day and that i am able to study. but its really unhealthy to do so. i know. and sometimes i start having very late supper so that i keep myself awake. but nowadays i see all my eye bags/ dark eye rings popping out and its ugly :( someone tell me what to do! ><