I learned recently that allowing yourself to be bored can improve creativity, so I like to limit my predrawing entertainment. I do something mundane and meditative, like eat breakfast without any other stimulation before I draw. It can really help with the enjoyment of sketching warmups and drills. Personally, I start with 5 mins of drills I don't have to think about, like connecting two dots with one smooth stroke, thin to thick lines, thick to thin, ellipses, freehand boxes in perspective from imagination, etc. Then I do some 2- and 5-minute gesture drawings from reference.sketchdaily.net. Then I draw for fun, either a project or just unplanned doodling, then at some point I do a lesson (right now I'm working through Proko's anatomy course). I'd love to hear how your daily sketching is going! That's exactly how I started cultivating a daily art practice, too. I've fallen off the wagon a couple times, but every time I climb back on it gets a little easier. Fingers crossed I've got it figured out this time but honestly what are the chances of that? Good luck to you!

it helps to know exactly what you are going to do the day before, for example on monday night i know that on tuesday morning i have to finish my personal illustration or to practice perspective etc. ,My routine is wake up at 6:00 am, get coffee, and then start to work, some warm ups like 3-5 minutes and then i start my practice or whatever i need to do. Hope it helps