Why is the PIC32 not entering sleep mode?

I am setting the Sleep Mode Enable bit (SLPEN) in the OSCCON register, but why is the device not going to sleep?

A write to the OSCCON register requires an unlock sequence first. Refer to the device datasheet for more information on this unlock sequence. Here is an example:

SYSKEY = 0xAA996655;
SYSKEY = 0x556699AA;

// now change the OSCCON register

// now lock again
SYSKEY = 0x0;

// now go to sleep
asm volatile("wait");
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