Here are some useful sleeping disorder resources to checkout, they include some UK government sites that have official advice on the topic. Before doing anything you should be consulting a legal professional for official advice.

https://www.rsm.ac.uk/sections/sections-and-networks-list/sleep-medicine-section.aspx
http://www.imperial.ac.uk/wearable-technologies/research/sleep-monitoring-and-analysis/
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/481398/2015-09223-Redacted.pdf
http://www.swansea.ac.uk/psychology/sleep-lab/
https://research.ncl.ac.uk/thethomasnasheproject/performancesevents/The Terrors of the Night script.pdf