I've experienced the same thing in the past.
here are some things that have motivated me:
1. Rent an office in a building with lots of other offices - having to get out of the house and seeing other people rushing about helped me
2. Spend more money, buy an expensive car, remodel your kitchen or something like that. The more i spend the more motivated i get. Sitting back and watching the bank account grow made me lazy.
3. Pretend you had to look for a 9-to-5 job. Look at the job classifieds. Go on a few job interviews. The thought of having to work for someone else makes me wanna puke and lights a fire under my ass. You need to remind yourself how good you have it.
