Uh, no. the manager is being unreasonable. Unless the manager pays your phone bill you can choose when and if you will answer your personal phone. ... That is also why we have office hours. I know a person that bought a second phone she uses exclusively for work contacts. When she is on vacation or off hours, she turns off the "work phone" and has told her directors when she is on vacation that she is on vacation and will address things when she returns. One of her directors pushed back and she told them that in their position they should be able to handle any crisis that could cross her desk. She went on vacation, turned off her phone, returned and discovered the office did not dissolve in her absense and there were no crisis that had to be diverted.
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One 11:30pm message may not tell you enough about whether you need another job. What may matter more is what the criticism reveals about the... expectations around your role.
Was this an exceptional situation where an urgent response was genuinely needed, or is being available outside normal working hours an unwritten expectation? And if it is an expectation, was that understood when you took the role?

It may be worth clarifying those boundaries before drawing a conclusion from this incident alone. If the expectation is routinely to remain available late at night, then you have something more concrete to consider: whether that way of working is compatible with the kind of working life you want.
The incident may not give you the answer, but it may have revealed a question worth answering. more

Yes start immediately, missing a call at such an hour is not such a grave mistake.

That is your time. Responding in the morning is the most appropriate thing. It is the manager that is over bearing. Not your fault at all. One uses do... give me instructions on Sunday on what to do on Monday. My rule was plan everything on Friday and share with me then. Anything else share on email and I opened work email Monday morning. 7 am. more

Any non-on-call role should safely anticipate their employees are at rest at such late hours. 7-7 is usually my rule. I do not expect immediate... responses during the evening to early morning. No traditional role should.  more

Yes!

Your manager needs to grow up and distinguish between work and frat party. It is probably a small private company and he may be an owner. In any case,... you will be better off to start looking while you have the job. more

Questions: 1) does your position require 24/7 availability? And 2) Do you usually reply to their late night messages? If the answer to both is, Yes,... apologize for not responding and do better. If you are not obligated to take after hours messages, have a discussion to clarify expectations.
Then take corrective action. Add an automatic reply to your devices. Set it to turn on at the same time each evening. For example: I am unavailable at this time, responses to calls and texts will be returned in order starting at (insert a time) am.
*This way everyone gets the same message. Keep it generic, so your not singling anyone out.
AND Yes. Update your resume' just in case more

What is the sop for responding to emails? It's usually
24 hours

I wouldn’t necessarily start job hunting because of one late-night message, but I would definitely pay attention to whether this is becoming an... expectation rather than an isolated incident. Unless your position specifically requires after-hours availability or you were on call, expecting an immediate response at 11:30 p.m. seems unreasonable.

I’d have a professional conversation with the manager about expectations for after-hours communication. If the expectation is that you’re routinely available nights and weekends—and that doesn’t align with the role you accepted or the work-life balance you want—then I’d quietly start exploring other opportunities.

One late-night message may not be a reason to leave, but a workplace culture that expects you to be available 24/7 without clear boundaries certainly can be. more

That manger is not professional atall ,he/she should respect staff and hours outside work mostly peoples private life.What does she expect someone to... do at 11;00pm sleeping time ?Ignore and tell them that you were asleep and didnt see the message.
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One 11:30 p.m. message alone is not enough reason to resign.
However, expecting an immediate response late at night and criticizing you for waiting... until morning is a warning sign about workplace boundaries.
If this happens regularly, especially outside working hours, weekends, or during leave, it becomes a stronger reason to consider leaving.
Start job hunting quietly, but keep your current job until you secure a better opportunity.
Don't confront your manager aggressively; instead, establish a professional boundary around after-hours communication.

Bottom line: Start looking, but don't quit yet. more

You should have some prerecorded massages like "out of working hours" etc and watch his/ her response after which you can decide your future course of... action. During my career I never craved after good reports etc. I was sincere to the job and gave 100% . I believed that promotion and other things depend on your destiny. I missed my promotion because of adverse comments once. That comments were due to refusal to go out of the way to consider a loan proposal. For me values are important than any other benefit. more

Even me I can't

Stand your ground and let them know that you were sleeping 😴 by that time and you didn't see the message until morning. When you're home anything can... happen. I could be drinking some wine that knocks me out. That's my business.  more

My manager did that to me as well. Might be the same person. Anyways, I dropped her the next day.