I work in a long term care facility where I charge at night with just one CNA and sometimes a float. We have 33 patients and quite a few are total care. I just do my vitals and assessments down the hall with the CNA during a bed check. I don't know how that could work for you but it is doable. It will make for a longer night though. Once the first bed check is done I may do a few other things that need to be done while the aide cleans or does what ever she needs too. If worse comes to worse, always do your patient care, use your brain sheet, and just stay late to chart.