Why is my Apple Watch not showing resting calories burned overnight?

My Apple Watch usually would burn resting calories when on charge overnight and i would start the day with 450-500 calories burnt when i put my watch on every monring.

However recently I've had the reoccurring issue that I put my watch on and it comes up with 0 when i wake up in the monring. This leaves me with a low-calorie account at the end of the day which is inaccurate, even if I do a massive workout.

Apple, please help me fix this issue as it's been happening for 6+ months and I want to fix it.

It should be showing up with 450 to 500 of resting calories burnt when I wake up and put my watch on however it keeps showing up with every few days.

[Re-Titled by Moderator]