Caffeine
Caffeine is a diuretic.  It may lead to nighttime waking and it may interfere with normal sleeping patterns. Avoiding caffeine before bed is recommended for people suffering from insomnia.  Some common beverages, foods, and compounds containing caffeine are listed below.

Serving Size

Amount of Caffeine

Black tea

1 cup (8oz.)

45-50 mg

Coca-Cola

12 oz.

34.5 mg

Coffee

1 cup (8oz.)

100-130 mg

Decaffeinated Coffee

1 cup (8oz.)

40-100 mg

Green tea

6 oz.

30 mg

Guarana

variable

25-50 mg

Mate

variable

25-50 mg

Mountain Dew

12 oz.

55 mg

No-Doz (max. strength)

1 caplet

200 mg

Kick citrus drink

12 oz.

54 mg

 

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