Looking for sleep detector preferably with digital output

Hi,

I am looking for an anti fall asleep (drowsy) systems (sleep detectors)
for in vehicles. Preferably with digital out put. Anyone can help me?

Follow-Ups:
- Re: Looking for sleep detector preferably with digital output
  - From: Everywhere Man
- Re: Looking for sleep detector preferably with digital output
  - From: robertlbass
- Re: Looking for sleep detector preferably with digital output
  - From: bdolph

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