Hello Ed,
Not heard about your sleep problem before, but it might be cured by Fusion 8.
There is no required order, but the easiest is probably by first going to Fusion 8 and then to Windows 10.
Some nice steps on how-to install/upgrade to Windows 10 are available at:
http://www.mikeroysoft.com/windows-10-and-vmware-fusion/
--
Wil