Ah, just what do you want to achieve?
Strictly speaking, you can't put the cpu to sleep and continue to have ssh access, the ssh access requires a running cpu.
Do you want to prevent the screen saver from showing up?
(The 5-series Kindles can go into a state that shows the screensaver, but it isn't 'asleep' because ssh (over USB) continues to work.)
if so, try:
home -> search -> enter:
;ds
(or maybe ~ds or `ds - I don't recall the magic character for the K5)
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