Can you have one without the other? Of course, you could have insomnia by itself, but insomnia and bipolar disorder are best buds. Best buds that drive me up the wall! I would kill for one whole night of ‘I can’t wait to get up in the morning and live life’ sleep. Bipolar gods, are you listening?! Well, in case they’re not, I’m off to a sleep specialist to discuss the twixt that is bipolar and insomnia.