Are there any devices to buy/rent that show arousals?

And yes, arousals of the sleeping kind! I was just wondering if there is anything short of a sleep lab that can be used as a metric of "unconscious arousal events". There are so many variables that could cause us to wake in the night - and the machines do not cover them. A pulse oximeter possibly - but you'd have to be pretty awake for your sat level to rise enough to show you waking up.

Any simple two lead EEG's - anything that can even suggest consciousness that we may not remember? Thanks.

This is a related device to what you want at a reasonable price available to consumers viewtopic.php?f=1&t=42560&p=375116&hilit=+zeo#p375116