Here to update after a busy week.

Karen felt giddy & had fever - 38.5 last night. I gave her medicine at 11pm & get her to sleep. Ken came home at 2am and I told him that Ren got fever. He went back to his room & touched Ren's forehead and asked if she had any medicine earlier. Ren told him that I gave her at 11pm.
Ken:" ok. I'll wake you up 2 hours later" (set alarm for himself to wake up)
Ren: "Orh."
(Amazingly, Ken really woke up 2 hours later to feed Ren with medicine).

As what Ren told me this morning:-
Ken woke up, touched her forehead (still got fever). Then he took medicine, pour a cup of water & brought to the room for Ren. After feeding her with miedicine, cover her with blanket - for her to sweat and get her to sleep again. He went back to sleep and managed to woke up for his BB meeting at 7.30am

And now, she is recovered - back to normal temprature.

Thanks to you, Ken.