You are allowed to recover before you have completely fallen apart.

Many people wait for permission in the form of a crisis, resting only once things have deteriorated far enough that nobody could object. That standard means you spend most of your life running on very little and only recovering after damage. Nothing requires you to earn rest through collapse. The threshold for looking after yourself can be set well before the point of emergency.

Think about what your current signal for stopping is, and how bad things have to get before you listen. Move that line earlier by one step this week. A quiet evening taken in time is worth more than a lost fortnight later.