Sleep aid developer Rythm has disclosed $22m of funding from investors including insurance company Maif, about $11m of which it has secured since early 2016.

US-based neurotechnology developer Rythm has launched its electronic sleep aid, Dreem, and disclosed $22m of funding from backers including insurance firm Maif and angel investors Xavier Niel and Laurent Alexandre.

Dreem is an electronic headband that is worn while sleeping. It uses polymer EEG electrodes to monitor brain activity, and auditory stimulation to help a user get to sleep more quickly and sleep more deeply.

Although Rythm did not specify when the funding was raised, it had previously said in…