ID 160079068945 © Elenabsl | Megapixl.com
Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
activity alertness awakening biological blood body bowel brain cardiovascular chronobiology circadian clock coordination cycle daily day diagram educational efficiency health healthcare healthy hormones hour icons life lifestyle melatonin muscle night phases physical plan pressure reaction regulation repeat rhythm rhythms routine schedule sleep sun sunlight temperature time vector wake wellbeing