https://aws.amazon.com/blogs/compute/understanding-the-lifecycle-of-amazon-ec2-dedicated-hosts/
In above article "Understanding the EC2 instance lifecycle" vs "Understanding the Amazon EC2 Dedicated Host lifecycle" , it appears that AWS doesn't support Hibernate functionality.
And i dont see any option from AWS management console to stop/hibernate a dedicated host.
In contrary, in https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/dedicated-hosts-overview.html
under Dedicated Hosts Restrictions , i see below:
There is a limit on the number of running Dedicated Hosts per instance family per AWS account per Region. Quotas apply to running instances only. If your instance is pending, stopping, stopped, or hibernated, it does not count towards your quota. To view the quotas for your account, or to request a quota increase, use the Service Quotas console.
So I cant find a clean answer where it clearly mentions that AWS support/doesnt support Hibernate functionality on dedicated hosts.