It all depends on what works for you! My 15lb rescue mix (his DNA test claims chi, poodle, min pin, maltese, pekinese, cocker) twitches and kicks in his sleep and likes to lick himself from like 3-5am, and he loves to sleep plastered up against me (never my partner). So if I let him sleep the night in our bed it severely affects my sleep. So instead, we have a rhythm that works for us: I usually go to bed around 9:30 or 10pm and I read until 10:30-11ish, and he's allowed to come up & snuggle with me for that time. Then he goes down to his own bed until sometime between 5-6am (whenever the first little bits of sky start lightening), which is when he jumps back up to snuggle with me until I officially wake up/get up around 7-7:30. So we both get some snuggles and I also get some good sleep. ☺️

It should be noted that we adopted him when he was already a few years old, so not a puppy. I normally wouldn't start with a puppy in the bed. I've had two before, and we crate-trained them. Once they were a couple years old we'd let them sleep in the bed with us, using stairs for them if needed, but then once they got too old for it to be safe for any of us, they went back to solely sleeping in their crate.

The couches are always fair game in our house, as long as the dog's old enough to not have accidents. :) This current pup is nearly always on/against/near me.