I think what you’re probably talking about, jay, is Resting Metabolic Rate. Your Resting Metabolic Rate (RMR) is the minimum number of calories your body needs to support its basic physiological functions, including breathing, circulating blood and all of the numerous biochemical reactions required to keep you alive. Your RMR is generally 60-75% of your total daily caloric expenditure.
Things that affect your Metabolic Rate:
Muscle - More muscle increases your RMR.
Age - Your RMR decreases with age.
A lower than normal RMR can be due to genetics.
The weather - Living in a cold enviroment can increase your RMR. I know this sounds strange but you expend more energy while moving around in cold weather. It’s a a lot easier to move around in summer but more of an effort to “get going” in winter.
Small Regular meals will increase your RMR.
Pregnancy can increase a woman’s RMR.
Crash dieting will decrease your RMR.
jay, there’s not much difference as far as caloric expenditure goes between lying in bed and puttering around the house. It’s not going to make that much of a difference either way.
Make changes to your diet based on BF%, scale weight and appearance, rather than the number of hours you’re sleeping per night.