I'd probably take a nap and retake the test on a normal working day. You also don't want to be excessively tired or stressed because that'll bias the results.
According to my doc, the Saliva tests should actually be done within 5 minutes of waking up in the morning following with the next two about 4 hours apart from each other and the last one taking place right before going to bed.
It is best to take the test when it can be returned or mailed back to the lab right away but you can keep overnight in the freezer until you get it mailed after the weekend as that is also recommended. Another reminder is to avoid caffeine as my doc told me and I've read this can affect your levels.
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