Is it gross to get dressed the night before and sleep in those clothes so I don't have to get up early to get dressed?keep in mind I shower before getting dressed
Not inherently, but it not being offensive depends on you nor sweating meaningfully overnight and your bed being fairly clean. Assuming you're normal in those regards, probably nobody will notice.
Don't listen to these faggots telling you to stop following your dream I do this shit all the time not only is it efficient it keeps you cozy. In the end your the real winner anon