I was just wondering if L-Lysine makes kittens drowsy? And I was also wondering what the average sleep time for kittens of 2 months is, because I thought that kittens slept less than adult cats because they are so playful:confused:

No L-Lysine shouldn't make your kitty drowsy. All felines sleep more that they are awake. However, you kitten is sick and we all sleep more if we don't feel well. At least usually.
However, It is quite normal for new puppies and kittens to sleep a lot. Young pets sleep a great deal, especially after meals.