Everyone does an assessment at the beginning of his/her shift, even if it's only four hours long, at my facility. Now, if I'm working nights and the person I'm following is thorough, I have no problem charting "Agree with above assessment" and then noting IVs, central lines, wounds, dressings, etc. along with any changes as my initial assessment. Four hours of a shift is awfully long to leave unaccounted for. If it's an uneventful shift, I use our hourly rounds, MAR, and other flowsheets to account for the rest of the shift. If there's a lot going on, I chart as needed on the nurse's note. (Everytime I call the doctor to address something, whether or not I received orders, what time Chemo/Blood/IVIG was hung and how the pt is tolerating it, what time it was complete, when the pt goes off the floor, changes in condition, etc.)
IMHO, those folks that wait until midnight are setting themselves up for a huge fall when the sh . . . . er . . . . .stuff hits the fan.