MY INTERNET TURNS OFF AT NIGHT EVERYDAY??!!?? PLZ HELP!!?

my internet turns off at night everyday around 11 or 10 oclock pm.. and then next day when i wake up i find it working.. i have a tp-link router TD-W8961ND.. i've asked somewhere else on the internet and some people said that its maybe parental control or some settings placed that can be changed from 192.168.1.1 but ive tried to enter the setting but couldnt find anything that has to do with the turning off interent.. so if u could help me find where i can change that setting also.. so for me as a student its really irritating coz the only time i get to sit on the interent is at night.. so if someone can help me plz do.. i would really appreciate it thx alot :D :D