The Magpies currently sit sixth in League Two but have so far been inconsistent in their results and displays for the most part.
"We are far away from where I want us to be," Sheridan told the Nottingham Post.
"As I've said before, the only game that I thought we played really well for a long period was against Plymouth.
"In the second half against Luton I thought we played well. Can you win a lot of games by playing well just for 20 to 30 minutes? I don't know. I don't think you can.
"But I feel the standard of football that we played against Plymouth, even though we lost, was excellent.
"I really do feel that if we had played like that then we would win a lot of games.
"But luckily for us we've played in patches and we've won games.
"And not only that we've played in patches which has got us back into games too.
"Against Grimsby we were two down and got a draw and it was the same against Boreham Wood.
"We have had 25 minute spells when we've dominated and we've either drawn games or sometimes won."
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