Sleep. It has truly been a godsend for my insomnia, and to get sleep is the primary reason I even use cannabis for. I enjoy most things more when I'm not under the effects. I can actually follow a plot in a movie and remember it afterwards when not high. I perform so much better in video games when not high and I'm a very competitive type of person. I'm much more social when not high, when high I'm usually a complete introvert. It just feels like it overall lowers my performance in so many aspects of life that to use when performance is the last thing that you need is only natural to me (sleep). Musical and culinary experiences are usually better for me when high too, so I usually use it only before my last meal before bed to which I head with my headphones on.
That's just me though. I do get weird looks from other smokers when I refuse to smoke when they offer me telling them I don't like to do it during the day.