One of my computers there is a Broadcom Netlink adaptor who has the option to "V" (activate) Allow computer to turn off this divice to safe power but it is not switched on (like you requested) but I can't get the reomote connected when the computer is in sleep mode.
If you want I can email you a screenshot
On the secound computer there is an INTEL 82579LM and there I do not have that option. There is a Enegry efficient ethernet option wich was switched ON I did switch that off and now I can get to the computer when he has rebooted but still not when he is in sleeping mode.
Just as an information ... I was a [censored] user before and never had a problem to get a connection to the computers even when in sleeping mode.