If we are grateful, Allah will give us more. If we strive to complete the sunnah, there will be contentment in our lives. If we provide some happiness to others, Allah will provide us with peace. To me it's a no brainer. Allow yourself to live, why punish yourself by depriving yourself of that which Allah made obligatory upon you. This life is short, there is no time to faff around, get on with living! If you have faith in Allah, He will facilitate your happiness, and if you are strong enough to strive to bring every aspect in your life back to the sunnah, then there will be no room for shaytan to make you weak. Aim for the sunnah, act on the sunnah, progress and achieve in this life and the next. Simples?
Oh and just because its 3.15am: