I would only consider this, if my child was already used to being left with those particular friends for shorter periods of time, for example, if they already watched him for a day or so, so my child would be used to them and comfortable with them and in their house. I think if your child was used to the people, and their house, and their child, then maybe. I mean, do you go over to their house all the time? Does your child seem comfortable and happy there, eating, listening to them, playing with their child? I only have one friend (besides family) whom I would allow to watch my child if needed, but my kids ( 19 months and 4.5 years) spend a lot of time in her house, or her kids come over to my house, so we know each others routines, I would sort of know how to take care of her kids, and she knows my kids very well. 8 days seem like a long time. Would your child know how to sleep in their house? My kids have trouble enough sleeping in their own beds, my son used to wake up frequently at night until he was 3.. how would your friends deal with that? Do you spend a lot of time in their house, enough so that your child seems very comfortable there? 3 years old is very young, thery are not independent enough, and rely heavily on routine. I think 8 days for a 3 year old might seem like a lifetime. I would not do it personally. I wouldn't even consider one night unless it was an emergency.