For those who wake up at night to check on the house or go to the bathroom.

Certain vitamin shortages can make you bruise more easily:

Vitamin C deficiency: Vitamin C is essential for producing collagen, which strengthens blood vessels. Without enough, vessels become fragile and bruise easily. Smokers are particularly at risk.
Vitamin K deficiency: Vitamin K is crucial for blood clotting and capillary strength. Low levels may slow clotting and increase bruising.
Vitamin D and B vitamins: Low levels can also contribute to increased susceptibility to bruising.

Other Causes of Bruising

Dietary supplements: Ginkgo, ginseng, garlic, ginger, omega-3s, saw palmetto, and vitamin E can thin the blood and make bruising more likely.
Medications: Blood thinners, aspirin, ibuprofen, steroids, certain antibiotics, and antidepressants may all increase bruising risk.
Aging: Thinner skin and weaker blood vessels make older adults more prone to bruises.
Sun damage: Years of sun exposure can weaken blood vessels.
Medical conditions: Diabetes, anemia, hemophilia, leukemia, and lymphoma can all affect clotting or vessel strength.
Sports injuries: Contact sports often cause contusions—another name for bruises—from direct impacts.