"I didn't sleep much [Saturday] night. I've been really focused and I haven't been lying to you guys. I always admit that you're always going to think of things in the future, there's too many hours in the day. But we've kind of as a group just focused on the next game, and the next game, and you try to portray that to the players."
The Islanders will miss out on the playoffs after making it in each of the past two seasons and three of the past four.
"You look back at seven or eight games in the beginning of the season, last two minutes, last three minutes where we lost some points, and it pains you," Weight said.
Weight admitted when the Islanders game ended on Saturday, he got in his car and watched the Penguins-Maple Leafs game on his phone.
Jake Guentzel gave the Penguins a 3-2 lead at 6:51 of the third period, but the Maple Leafs scored three straight goals late to clinch the final playoff berth in the Eastern Conference.
"[Jake Guentzel] missed an empty net and you're cursing him, and five seconds later or a minute later, he's bouncing it off three skates," Weight said. "You're thinking, 'All right, this is going to happen.' It was disappointing. You want [Sidney Crosby] to raise that one and get it in the roof (of the net) and see what happens in OT. But the fact is, you didn't control your own destiny. And the real fact is, Toronto, they're a young team and they answered the bell. They've had some tough situations throughout the season where people were questioning them, the whole year. Boston and Toronto got it done. Tampa and us are on the outside looking in. You make your bed."