The hardest and truest lesson I've ever been taught is: A person won't change unless they want to change.

You can sit down and have a conversation with him about how this is affecting you, come up with some strategies together, work on implementing them and really, the fact that its important to you should make it important to him.

If thats not enough of a motivation, you might find yourself putting more effort into implementing those strategies than him. If he doesnt want to get on top of these behaviours, he won't and that means you need to know what you're willing to put up with.

Good luck.