Sleep is one of the essential needs of the human body and can very well make or break our moods. We need it to survive, to focus and, well, to reason. Some of us prefer to sleep snuggled up with a warm, cozy blanket, while others opt to sleep with a simple sheet and keep the room at a lower temperature. But according to a Japanese study, chills in the bedroom aren’t necessarily a good thing.

Researchers found that people who slept in cold rooms with temperatures below 57 degrees experienced a spike in their systolic and diastolic blood pressure rates from 6 to 8 percent after waking up in the morning, compared to people who spent the night in a room with an average temperature of 76 degrees.

Blood pressure naturally rises when you wake up, mentioned study co-author Keigo Saeki, M.D., an epidemiologist from Japan’s Nara Medical University. However, when you get out of bed in a cold room, the blood vessels in your skin tighten and cause your heart to pump more blood to warm you up. The added boost in blood pressure can last for up to two hours and with time can cause serious issues with your heart, added Dr. Saeki.

While your first instinct might be to turn up the heat in your home, you might want to think again, as that can lead to higher heating costs and also disrupt your sleep.

Men’s Health suggests programming your home’s thermostat or portable heater to a temperature of 72 degrees at least a half hour before your wake-up time.

Related: Lower Your Blood Pressure with These 19 Healthy Foods


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