It's for the better that Klaus doesn't bring it up, that would make it more real and force Five to admit he realized he had a problem. Well, he's got several of them, drinking just is the one that catches unwanted attention first.

Normally he can’t stand much human contact but tonight having his brother in his personal space it's actually comforting. Klaus doesn't get his hand swatted away, a miracle. Five's still burning up, which is bullshit in his opinion, giving how cold he feels. Looks like his fever still needs to break.

"Ok, we can lie down again, see if you can get some more rest." If not, then Five will make an effort to fight sleep and keep him company.