You should have no problem at all............especially with night shifts.
Some hospitals now use only specific agencies, so find out which agencies are doing most of the staffing at where you wish to work....and sign up with them.
As stated above, sign up with several agencies.
And if you are on the East Coast, remember that summer vacations will be coming up soon, so you almost always see more agency used. And if you really like the facility, and they like you, they may let you advance schedule for the shifts that you want for the month........
Good luck...........
(p.s. I have worked agency for most of my nursing career and have never had a problem finding work.)