For our final step we will position the pulse oximeter to the ring-finger of the non-dominant hand.

Slide this finger into the oximeter with a 1mm tip of the finger protruding from the opening at the end (the top of the sensor is the side with the small engraving of a fingertip).

The cabling should run over the knuckle and the back of the hand, with a loop of tape holding the cable to the finger and a further strip of tape holding down the cable to the back of the hand. It should then run up the sleeve and out the neck of the participant's sleepwear.

1mm of finger protruding

Plug the connector into its dedicated port at the base of the SOMNOtouch.

Like the nasal cannula, this is one of the most important measurements of the study, so you should avoid (as far as you can help it) sleeping with any pressure on this sensor (i.e. sleeping with this hand under your pillow or body) as this will disrupt the signal. And if the signal is lost for any extended period of time, your physician may decide to repeat the study.

But we're confident that if you've followed these instructions, your study will yield worthy results. We further hope that you have a very good night's sleep!

*The SOMNOtouch will automatically begin recording at the sleep time you will have discussed with our staff (it may have already started!) Please try not to turn your lights out too long after this time.