Thank god I did not read review before watching this film I did not know it's about sleep I first thought it's horror then thriller then killer then again horror and then at last it was a surprise ,it kept me at edge of my seat ,I don't know why so many people did not have brain to understand this film,one of the best movies I watched in recent times ,kudos to the team ,first 15-30 mins or so I got bored and switched off the movie then later I decided to watch and felt very Happy for watching it ,I think people who don't understand the movie only comments its a waste ,cannot blame their IQ it's okay ,I wish this movie was a blockbuster ,but it's okay anyways many amazing films like ayirathil oruvan ,uthama villan was a flop at that point of time 10 years later people loved it