There is no point ignoring sleep - you can’t steal hours from what the sleep deserves. You can be happy for a day because you got some extra hours in your day to work on things you enjoy. Or to “relax” by watching some mindless videos that YouTube’s recommendation engines serve you. Or to read those articles you have been adding to your Instapaper queue. Or to binge watch and complete that one season of the show you enjoy on Netflix.
Sure, you can do all this on a late night by stealing some hours from sleep. But it vehemently gets back at you. If not on the very next day, you have to pay back in the week that follows. For days in a row. It is better to let sleep carry on with its routine.