Mix Up Your Routine

Try to do something different or creative everyday.  Studies have shown that doing this keeps you healthy and vibrant and happier.  An added bonus: It's also said to give you better dreams at night.

If the brain isn't challenged in some way everyday it has an atrophying effect.  A sort of intellectual/creative malaise starts to set in.  It's the same as a muscle would atrophy if don't work it out.

Keep trying to learn something new or do something that's out of your comfort zone.  This is the way you grow and really live life. Maybe try to learn a new language or play an instrument, even if it's just for a little bit everyday.  20 minutes a day is much more effective than trying to learn it all when you finally feel like it.