Sometimes, when your eyes just want to close, there’s nothing for it but to close them. I highly recommend that, because putting it off can mess up a sleep-rhythm that knows what it’s doing.
In some circumstances, though, it can be highly inappropriate to simply close your eyes. In that case, I advise deferring temporarily and then going nap-hunting when you can.
Of course, I’m talking about nap-hunting only in the most non-violent way. You can take your own nap, but never try to take someone else’s nap. That could be trouble. (Credit goes to Shel Silverstein for the taking-of-naps idea.) But even for your own nap, you generally need to hunt down the right conditions for it to happen.
Once you’ve got the right conditions, interruptions certainly won’t do. The duck decoy? He’s there to lure others away so you can keep your quiet all to yourself.
Enjoy your nap.