Nope, you don’t have to (especially if you are doing it minutes before bed). If you are feeling restless, though, you might want to. “It can be done separately, but doing asana first may be better because the body and the mind are fitter and calmer after physical exercise,” Mittra says. So, yoga nidra is flexible. If you’re doing it on your own at home, it’s up to you to cultivate svadhyaya, or self-study, and decide what you need.