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 

 Ronan Keating :: If Tommorow Never Comes

                  Am
Sometimes late at night
D               C/G  G    C  G
I lie awake and watch her sleeping
      D                Am
She's lost in peaceful dreams
          D                  C                G     C/G  G
So I turn out the lights and lay there in the dark
G                          Am7
And the thought crosses my mind

(Small Solo, With Capo) 
Switch To D Chord Right After Playing Last 5 Note
|--------5--7--8--7--5-------------------------|
|----------------------------------------------|
|----------------------------------------------|
|----------------------------------------------|
|----------------------------------------------|
|----------------------------------------------|
D                         C/G  G   C/G  G
If I never wake up in the morning
D              Am7       D
Would she ever doubt the way I feel
C               G     C/G  G
About her in my heart

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


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


G                             Am7
So tell that someone that you love
                          D
Just what you`re thinking of
                  C      G/B  Am  G
If tomorrow never comes

Comments : adamast@lineone.net 

 Verse1:
“Sometimes late at
 night..”
G-----------|-----------|-----------|------------|
D-----------|-----------|-1---------|------------|
A-3---------|-----------|--—-1------|-1—-1-------|
E-----------|-1---------|---------1-|------------|

G-----------|-----------|-----------|------------|
D-----------|------1----|------1----|------------|
A------3----|-----------|-1---------|-1----------|
E-1—-1------|-1--1------|-----------|------------|

G-----------|-----------|-----------|------------|
D-----------|-----------|-----------|------------|
A-3---3-3---|-----------|-6---------|------------|
E-----------|-1---1-1--/|-----6-6---|-6---6-6---|

G-----------|-----------|-----------|------------|
D-----------|----3-1-—3-|-------1---|------------|
A------3----|-----------|-1---1-----|-1----------|
E-1--1------|-1---------|-----------|------------|

Chorus:
G-----------|-----------|-----------|------------|
D-1--1-1----|-1--1-1--3-|-------/5p3|------------|
A---------1-|-----------|-1--1-1----|-1--1-1-----|
E-----------|----------1|-----------|------------|

G-----------|-----------|-----------|------------|
D-----------|----3-1-1h3|-----------|------------|
A------3----|-----3-----|-1--1-1----|-1--1-3-5---|
E-1--1------|-1---------|---------31|----------86|

G-----------|-----------|-----------|------------|
D-----------|-----------|-----------|------------|
A-6--6-6----|-6--6-6-8--|-10======-|------------|
E---------6-|-----------|-----------|-3----------|

G-----------|-----------|-----------|------------|
D-----010---|-----------|-----3--1--|------------|
A-3--3---31-|-----------|-1—--------|-1—---------|
E-----------|-1---------|-----------|------------|

Verse2:
G-----------|-----------|-----------|------------|
D-----------|-----------|-----------|------------|
A-3---3-3---|-----------|-6---------|------------|
E-----------|-1---1-1--/|-----6-6---|-6---6-6----|

G-----------|-----------|-----------|------------|
D-----------|-3--3-1-—3-|-------1---|------------|
A------3----|-----------|-1---1-----|-1--1-1--1h3|
E-1--1------|-----------|-----------|------------|

G-----------|-----------|-----------|------------|
D-----------|-----------|-------8=8-|------------|
A-3---3-3---|-----------|-6--------8|------------|
E-----------|-1---1-1--/|----6-6==--|-6---6-6----|

G-----------|-----------|-----------|------------|
D-----------|-----31—1h3|------1--3-|------------|
A------3----|----3------|-1--1------|-1--1-3-5---|
E-1--1------|-1---------|-----------|----------86|

Chorus:
G-----------|-----------|---------------|------------|
D------/10p8|-----------|---------------|-8--8-8--8--|
A-6-6-6-----|-6--6-6-6h8|------10p8-10p8|----------8-|
E-----------|-----------|6--6-6---------|-----------6|

G-----------|-----------|-----------|-------------|
D-----------|-3--3-1--3-|------3--3-|-------------|
A------3----|-----------|-1--1------|1--1--3--5---|
E-1--1------|-----------|-----------|-----------86|

G-----------|------------|------------|-------------|
D-----------|------------|------------|-------------|
A-6--6-6----|-6--6-6--8--|10--1010—10|-----------1-|
E---------6-|------------|------------|-3--3-3--3--3|

G-----------|-----------|-----------|------------|
D-----010---|------3----|-----3--1--|------------|
A-3--3---31-|-----------|-1—-1------|-1—---------|
E-----------|-1--1---1--|-----------|------------|

Outro without bass