Jade with the program you've set yourself... less sleep to build another online business... And then wanting to get into the creative swing of things. I see a problem of overwhelm. You need to find the right balance for all the things you do.
While the Paraliminals discussed are all helpful I think you'd be better off with the Natural Brilliance course. So you can Release, Notice, Respond and Witness in a timely fashion. You may sleep less and become a bear with a sore but with the Natural Brilliance model you be able to get done what needs to be done better.
On the creative front. Grab a stack of magazines with pictures that you like. (Cartoons if you want to develop cartoon skills). Next grab a ream of copy paper and set a timer for 1 minute. Take the first picture and copy elements of it. As much as you can draw in 1-minute. Turn it face down and do the next one. Do five to ten 1-minute drawing in a sitting. At least one sitting a day for 3 week. A no time look at your completed drawings until the end of 3 weeks. Then compare your earliest to latest and I sure you'll find the creative flow again.
Alex
