And sleep doesn't always stay slept. We've had machines wake up in bags so when later needed they have near flat batteries and are nice & toasty³.
So sleep/hibernate not working right is hardly a significant difference when comparing Linux to Windows. In fact one of the laptops I had trouble with did sleep and hibernate properly when Linux went on it for a while, so at least sometimes the difference is not in favour of Windows.
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[1] the couple of times that happened to me, the machine would still work via RDC and other such so an orderly restart could be arranged if I had another machine on the same network, but if I had no such machine available like when travelling a hard-reset had to be forced
[2] I'm told you can force it to be available again, but I assume the removal is an admission that is doesn't work properly so enabling it is risky
[3] being in a bag isn't great for cooling airflow!