Anemia

A short­age of healthy red blood cells or hemo­glo­bin, lead­ing to fatigue and weak­ness, with many pos­si­ble under­ly­ing caus­es.

Sleep research — includ­ing Stan­ford’s SleepFM study — has found that sig­nals record­ed dur­ing a sin­gle night’s sleep can be asso­ci­at­ed with future risk of this and relat­ed con­di­tions. This is gen­er­al infor­ma­tion, not a diag­no­sis. Learn about the research behind this entry →