body battery

This is interesting. I can't say anything to help, but I've found that some nights my Body Battery charges fully or to nearly 100% and some nights it seems to stall around 75% and either sticks there or starts to climb again just before I wake. I'll try to see if where I sleep (as much as I can monitor that) affects this.

HI there, could you be sleeping on your arm at all on one side? You could be constricting blood flow. For instance, I know when I sleep on my right side, I sleep on top of my arm if that makes sense, I notice this in my graphs.

I know that sometimes the registration is interrupted, but that is not the reason for the difference between laying on the right or left side. The difference is there also when I am just laying, while not sleeping. Some-one also noticed that for him or her sleeping during the night charged only 25 percent, while it charged 18 percent during a nap of 20 minutes during the day. My experience it different: in my 25 minute naps after lunch it never charges. I think that my stomach is working very hard at that moment.

My apologies, I meant meaning laying on your arm. Cutting the blood flow off in your arm when laying on it is what I was trying to explain. The heart rate is just part of it. Here is a list of how it works. 

• Your Body Battery level updates when you sync your device with your Garmin Connect account.
• For more accurate results, wear the device while sleeping.
• Rest and good sleep charge your Body Battery.
• Strenuous activity, high stress, and poor sleep can cause your Body Battery to drain.
• Food intake, as well as stimulants like caffeine, has no impact on your Body Battery.

If its still not charging, we can have you reset it and then give it 2 weeks to see how the body battery is charging. 

Yes! Also wear my watch (Vivosmart 4) on my left wrist but find my body battery does not increase and heart rate is higher when lying on right side. Would be keen to find out if this is a fault/quirk or if sleep on left is genuinely more restorative (I know it's thought to be better for digestion). I have hip pain if I sleep on my left so trying to decide whether to push through

Interesting observation Jenny, that heart rate is higher when you sleep on your right side. Heart Rate must be one of the basic ingredients on which the charging of the body battery is calculated. Heart Rate is also a basic measurement of a Smart Watch. You can probably say that when your heart is pumping faster it means that your body needs more energy and that therefore there is less energy for the battery. It is possible that the heart feels different constraints when you are lying on one side rather than on the other side and as a consequence the pumping requires more energy on one side than on the other one. I will check whether I can see this difference in the heart rate depending on the side on which I sleep. I have never seen the formula for calculating the charging of the body battery. Probably this is an enterprise secret. So they could stick just another value for sleeping on the left side than on the right side in their formula that has nothing to do with what i really happening in your body. It would be interesting to have the real formula, than we could learn more about our body. We should try to reverse engineering the formula. I have somewhere seen that also respiration rate and respiration rate in rest play a role.