Thank for to those who replied.  I solved it just a while ago.
It wasn't the floating pins giving the problem.
I forgot that a keypress has TWO events (key-down and key-up).  I was only
clearing key down event but did not clear the key-up event before going to
sleep therefore since there is pending interrupt, sleep does not execute.

-----Original Message-----
From: Basir Atan <basir_atan@geocities.com>
To: PicList <PICLIST@MITVMA.MIT.EDU>
Date: Tuesday, January 26, 1999 12:35 PM
Subject: PIC16F84 Does not want to SLEEP (insomnia?)


Hello all,

Quick question and hopefully quick answer.  I use the following code to put
PIC to sleep:
    movfw   PORTB           ; Clear Mismatch
    clrf    INTCON          ; Clear RBIF (if any)
    bsf     INTCON, RBIE    ; Enable PORTB WakeUp
    sleep
But the PIC does not go into sleep.  Any obvious error here?
TRISB is '11111100'.  Connections are as follows:
    RB0    - pull up with 10k
    RB1    - pull up with 10k
    RB2    - floating
    RB3    - floating
    RB4    - pull down with 10k
    RB5    - pull down with 10k
    RB6    - floating
    RB7    - floating

Thanks for any help