They do. I'm pretty lucky, I live with my sister who knows when I've been working (and has saved my ass from being late a few times too when I've overslept) and my phone goes off. It helps that a lot of the people I know either know I work late or are out late with me ;)
Ah you need to find that nice middle balance. It's fairly elusive so I hope you manage it. If insomnia strikes again I'll probably be around though ;)