Noone has quite gotten this right yet. Here's my attempt.

Bb                Cm7
Sometimes late at night
F                        D#/Bb  Bb    Cm/Bb  Bb
I lie awake and watch her sleeping
      F                Cm7
She's lost in peaceful dreams
          F                  D#                Bb     D#/Bb  Bb
So I turn out the lights and lay there in the dark
Bb                         Cm7
And the thought crosses my mind
F                         D#/Bb  Bb   Cm/Bb  Bb
If I never wake up in the morning
F              Cm7       F
Would she ever doubt the way I feel
D#               Bb    D#/Bb   Bb
About her in my heart

Bb                D#
If tomorrow never comes
                         Bb
Will she know how much I loved her
                   F      Cm7            F
Did I try in every way to show her every day
     D#            Bb 
That she's my only one
          Cm7     Bb/D        D#
And if my time on earth were through
                       F         Gm7     Dm7
And she must face this world without me
Gm                            Cm7
Is the love I gave her in the past
                   F
Gonna be enough to last
                  Bb        F/Bb  D#/Bb
If tomorrow never comes


  Bb                              Cm7
'Cause I've lost love once in my life
F                        D#/Bb  Bb    Cm/Bb  Bb
Who never knew how much I loved them
        F            Cm7
Now I live with the regret
               F                D#         Bb     D#/Bb  Bb
That my true feelings for them never were revealed
Bb                         Cm7
So I made a promise to myself
F                            D#/Bb   Bb   Cm/Bb  Bb
To say each day how much she means to me
        F              Cm7      
And avoid that circumstance
                    F              D#            Bb    D#/Bb   Bb
Where there's no second chance to tell her how I feel


Bb                            Cm7
So tell that someone that you love
                          F
Just what you`re thinking of
                  D#     Bb/D  Cm7  Bb
If tomorrow never comes