I took aspirin and now feel drowsy?

How many you take? How many aspirin did you take? But YES, drowsiness can be an uncommon side effect of even low dose aspirin. You should discuss this with your physician since other causes of drowsiness should be checked into which could be unrelated to aspirin therapy. If you'd like to speak about this with me then, write me at: www.healthtap.com/drsaghafi.
Not common reaction. Feeling drowsy or somnolent is nota common reaction to aspirin. If this happens again you should report it to your primary care physician.