A new study found that exposure to a little bit of light while sleeping can negatively affect our health.

This Northwestern University study found that volunteers who slept with a brighter light, as bright as street lights through a window, spent less time in a deeper sleep, which is when the body repairs itself.

They also had higher heart rates during the night and more problems regulating their blood sugar the next day.

Could you benefit from an eye mask at night, black-out curtains for your bedroom, or removing your clock and phone each evening? Your blood sugar may appreciate it.