I have literally drank a cup of coffee while sitting in bed, finished it, shut out the light and went to sleep. Caffeine has no effect on me whatsoever. I drink one coffee every morning (except weekends) because I enjoy it. I eliminated sweetener of any kind a few years back, but I have it with cream or half and half(real,never "creamer") and will never give that up. A bit of milk fat is actually good for you.