Can heat when sleeping raise heart rate such as being hot from the blankets or covers and furnace?

Thanks for asking! Yes, when your body is warm, and your muscles are lying still, your blood vessels will dilate. This increases the space your blood volume fills. The preload, or filling of your heart will decrease which will increase your heart rate.
Generally Not. Heart rate goes up in normal people by about 10 points per degree of temperature elevation, but that's "core" (internal) temperature which is extremely hard to raise in the absence of disease. The body has spent 50, 000 years learning to cool itself, and does so with great efficiency, so it's not usually a blanket alone causing this. That said, overheating is never a great idea.

Related Questions

Can heat of any kind should it be blankets or air temperature raise your heart rate?

Complicated. Fever will certainly raise your heart rate. Discomfort from any cause, including feeling too hot, will raise your heart rate. If you're chilly and get under blankets or sit in front of fireplace, i don't believe you would see an increase in heart rate other than that which is associated with activity itself. Read more...

Can sitting in the heat for an extended period of time raise your heart rate?

Yes. Dehydration can cause tachycardia (Fast heart rate). But this could be a sign of an irregular heart rate as well. Key is to make sure the rhythm is at regular intervals. if its not, then you have to worry about atrial fibrillation. http://amansawmd.com/2014/02/17/atrial-fibrillation-overview/ Read more...

Is it normal to have a faster heart rate in hot weather? Also who is more likely to get heat stroke?

Heat. when the body is under heat stress the heart rate does increase. Getting dehydrated and overheated without adequate cooling potential predisposes to heat stroke. Read more...
Yes. higher risk: dehydrated, on medications that can decrease sweating (benadryl (diphenhydramine) or similar medications, certain anti-psychotics, and many more), elderly and small children, illness with fever. Read more...
Heat Stroke! Heat stroke is the most serious form of heat injury and is considered a medical emergency. If you suspect that someone has heat stroke -- also known as sunstroke -- call an ambulance immediately and give first aid until paramedics arrive. http://www.webmd.com/a-to-z-guides/heat-stroke-symptoms-and-treatment#1. Read more...