Social jet lag has been linked to a weakened immune system. What you can do about it - ANALYSIS: Getting out into daylight ...

Erin explained that social jet lag is 'really common,' adding: "It can make you feel more intense sleep inertia, which is the ...

Chronic fatigue syndrome isn't just being tired. It's a new state of fatigue that has lasted for at least 6 months. CFS is more than feeling tired all the time. It comes with a lot of other ...