If your head hits the pillow and you're out like a light each night... good luck to you. For many people, sleep is a little more complex.

And for more and more people, their bedtime involves tech... wearable sleep trackers like rings and watches... even gadgets for under the mattress.

Sleep monitoring is a booming industry. People who are deep into analysing their shut-eye have even been labelled "sleep data nerds."

But is all this extra data helping people get a more restful night's sleep?