Hi,
I've created a skill for Amazon Alexa devices which plays Lullabies to help children fall asleep. It has three Lullabies, one of which lasts for 2 hours. If need be the Lullabies can be set to continually loop.
It's called Baby Bedtime Lullabies and can be accessed/enabled at www.amazon.co.uk/dp/B0764L3T5F?tag=mumsnetforum-21
It's in the "Kids" category of the Alexa skill store so you do need to enable kids skills in the Alexa app (Settings/Alexa Account/Kids skills) to use it.
Hope somebody finds it useful, any questions please ask.
( Positive review comments in the Alexa skill store are appreciated
)