This is a common thought that seems to occur to a lot of people.

The flaw is that, when you go to sleep, you will wake up later. The situation is not analogous to quantum suicide.

Quantum immortality asks us what future experiences could plausibly be considered "mine". In the roulette case, only worlds where I survive have such experiences.

But in the insomnia case, there are future experiences that are "mine" in both the worlds where I remain awake, and the worlds where I fall asleep. The fact that those experiences are not simultaneous is irrelevant.