Are you exhausted from the kids, or because your job exhausts you too much to have energy left for them? In which case change jobs? Sure kids are tiring, temperamental, they go completely hyper, argue incessantly about stuff, don't get ready to go out when asked, don't go to sleep then are tired and fractious next day, change their mind about what they want to do when you made a big effort for them, fight with each other (as well as being very nice and caring to each other next minute) etc etc. But they're delightful, and funny, and super companions at the same time. As for hobbies, as others have said, finding hobbies you can do with your kids is good. The great outdoors and music making can be shared at a young age, if they're into that. I found even reading them stories, as they get older the books get more interesting, many kids books are actually fascinating for adults.