Simple remedy for it, wake up before dawn and start practicing. Before you know it it will be day time and you're still practicing and you know you will be too tired in the evening to play.
It is always refreshing to rise with the sun and settle down for rest as it sets. I can see the attraction of studying in the dead of night, for one it is so quiet and you usually won't get a telephone call or door knock to disturb you. The quietness appeals to me a lot, I hate practicing and hearing a automobiles roar past. But you look outside you have only evening, darkness surrounding you. Maybe if you study dark and gloomy pieces this is ideal. I like go outside for a walk during the day, observe life around me, animals doing their thing, people busy etc.