Israeli startup Nexense manufactures a device to treat snoring and sleep apnea. Worn as a chest strap or wristwatch, it detects snoring or sleep apnea and then vibrates to help the patient resume breathing or stop snoring, without waking him / her up.
http://nexense.com/?page_id=87
http://www.globes.co.il/en/article-sleep-apnea-treatment-co-nexense-raises-3m-1001099272