Crocs are now being knocked off by a lot of other companies jumping on the bandwagon... about 2 years too late. Now, they're available in flea markets, stop and robs, and lots of shops in the mall.
Leather sandals with a strap are difficult to put on quietly if they have a hook and loop closure, and difficult to put on while still coming out of REM sleep and distracted by a bad situation. I have a pair of Teva (Tev-uh) leather sandals that are like birkenstocks that I wear all the time. But, they can be hard to put on without light and focused attention. Two things you may not have if this situation happens to you.
Yes, I'm a bohemian long hair white guy.
I use a pair of bright orange croc knock offs that I can slide into easily for night time footwear. I 'spose I could spray paint them black for tacticoolness, but I actually like the orange.
Checking for intruders with an edged weapon isn't an altogether bad idea, if you know what you're doing with the knife.