Thanks Admin1 - I can now keep myself busy with this wonderful spreadsheet.
On reflection, perhaps Unix times would be good as it would allow me to analyse who goes to bed earliest on an average Wednesday. If it's not too much trouble an update with timestamps would be great.
Also, on opening Excel I got an error message about cell contents being too long. These may have been truncated which would put some of my utterly useless statistics into question. Does it come out as a .csv or similar? if so, please send that as well as the spreadsheet version.
"The first duty of Port is to be red"
Ernest H. Cockburn