We know that
• The average is 0.45 calories per hour.
,
• The energy stored is 3500 calories per pound of body fat.
,
• The mass is 150 pounds.
,
• The hours of sleep are 8.
First, we have to multiply the mass 150 lb by the average rate

This means that this person burns 67.5 calories per hour. Now, we have to multiply this rate by 8 hours.

Therefore, a 150 lb person would burn 540 calories during 8 hours of sleep.
Now, we know that 1 pound of body fat is equivalent to 3500 calories. So, let's use a rule of three to find the period of time would take this person to lose one pound of body fat (3500 cal).

Let's solve for x

Therefore, this person would have to sleep continuously for 51.9 hours to lose one pound of body fat.