Sleeping arduino

Hi, im using an ARDUINO MEGA 2560 and a ADXL335 accelerometer, im reading about making sleep an arduino, and my question is the next, can i make my arduino go to sleep using the code i found in here http://arduino.cc/playground/Learning/ArduinoSleepCode, and if im not going to make any dame to the arduino, while using it thanks

Yes and no.

why yes and no??

can i make my arduino go to sleep

Yes

and if im not going to make any dame to the arduino, while using it

No.