[Tinyos-help] about sleep mode

[jiwen zhang]

Hello all:
   In the sensor network,we have to make nodes go into sleep mode in order
to save power. In tinyos2.x, i want to know whether it is done by operation
system or not? can we make it go into sleep mode by hand and how?
  what does the operation system do to make the node go into sleeep mode ?
for example,turning off radio?
  when a node has gone into sleep mode, is  the timer  working ? because i
want the node wake up in a fixed time,so i use the timer to realize that.
  thank you very much!!
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