6. Steak 'N' Shake Open until: the cows come home (it's a 24-hour joint)
I, for one, was excited to welcome Steak 'N' Shake to Houston when it opened its FM 1960 location earlier this year. Back when I had to travel a lot to for work to some very small, very unlikeable towns, the trim and chipper local Steak 'N' Shake was often my only bastion of sanity -- particularly late at night, when I was feeling lonely and bored in my Super 8 motel room. There are now four locations scattered throughout Houston (one in Katy, one in Pearland and one in Webster) and all are trusty spots to get a cheerful midnight milkshake or burger in parts of town where Denny's or IHOP may otherwise be your only options.
5. Genji Open until: 2 a.m. every night of the week
Genji recently relocated from the same Westheimer strip center that also housed Friends Pizzeria to a new Westchase spot, but kept the same late hours. It's still the most reliably awesome karaoke in town (complete with binder of songs that's labeled "Engrish songs by title" unironically) as well as the best spot to get a late-night meal of udon, katsudon or a Japanese omelet covered in ketchup. (Don't knock it till you've tried it.)
4. Onion Creek Open until: 2 a.m. Wednesday through Saturday, midnight the rest of the week
Onion Creek Coffee House, Bar & Lounge (its full Christian name) is practically open all the time, starting with breakfast at 7 a.m. and ending most nights at 2 a.m. It's the living room of the Heights, with a cozy interior that's reminiscent of a hipster hunting lodge and a sprawling patio that's usually packed at all hours, so you never have to drink (or eat) alone. The Frito pie is reason alone to go, however, topped with creamy squiggles of cool sour cream and spicy pickled jalapenos in addition to the cheese and chili.