Sleep teams are rather tricky to make. I would recommend some pokemon that take advantage of the opponent's inability to move, like focus punch breloom. And some that can spam hypnosis or dream eater, like absorb bulb yanmega
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There is no best team unless you hack it. any pokemon can be good if trained correctly
my team
swampert or blaziken are the best type to beat gyms or Pokemon league
There is no absolute best team. If you have 6 Deoxyses on your team and the opponent has one Darkrai, your team will essentially be destroyed. It all depends on diversity and which types of Pokemon you prefer.
It is impossible to actually sleep on the game, but you can rest at your house, the Team Galactic Nap Room (lame, right?), and certain inns around Sinnoh.