[debacle]

What is limited caffeine? I see/hear this a lot recently, how much caffeine impacts our sleep cycle. I have 2-3 caffeinated beverages a day (usually 1 dark coffee and 1-2 cups of tea), but wonder if even that limited amount is impacting my sleep cycle.

[xenihn]

I think it depends on your height and bodyweight, tolerance, and how quickly you metabolize caffeine. You also should be counting total mg of caffeine ingested.

I metabolize caffeine slowly and have practically no tolerance. A medium-sized latte anytime after 5 PM will keep me up all night. A decaf equivalent will make it really hard to fall asleep (remember that decaf still has caffeine).

I think my limit when not ingesting caffeine in the early morning is about 200mg before I have issues with falling asleep.

[robgering]

I think the optimal quantity of caffeine varies from person to person and would be affected by individual tolerance and biochemistry.

I've seen research suggesting the use of repeated low dosages (20-200mg per hour) throughout the morning and early afternoon for optimal performance. However, many of these studies have very small sample sizes and should be read cautiously.

I feel best with no caffeine at all.