Hey there ! This is my first tab,hope it's accurate,don't hesitate to tell me in the
comments if you spot any mistake ! Tom Fletcher from McFly posted  his acoustic version of
this song a couple of days ago on Youtube (originally it was performed by McFly and V) : 
http://www.youtube.com/watch?v=jFn-TtSc4cs Listen to this version to get the rhythm 
right !

Chords used :
C : x32010
( Cadd11 : x33010 just do a regular C chord and add your pinky on the D string 3rd fret)
Cmaj7 : x20010
Am : x02210
F : xx3211 or 133211
Fm : xx3111 or 133111
G : 320022
Em7 : x22033
Am7 : x02213

While playing the C chord in the verses,he occasionally turns it into a Cadd11 chord by
adding his pinky on the 3rd fret of the D string,by listening to the song you can hear
when he does it,it does not change the song in any way if you don't do it ! But it 
sounds pretty !

Intro : C (hammer-on and pull-off on the D string 3rd fret with your pinky)


C                              Cmaj7      Am
Being with you was all that I needed

Am
And I don't know why you were too blind to see it

F
Now you're gone

Fm
And I need you here tonight

  C (hammer-on and pull-off on the D string 3rd fret with your pinky)

C  G                                 Em7
You know that I can't sleep 'cause I'm terrified

               Am                     F
Feels like I'm falling down really fast inside

G                      Em7
And I'm wishing the night away

Am7
These chills in the evening

         F          Fm
They won't go away

  C (hammer-on and pull-off on the D string 3rd fret with your pinky) Cmaj7

C                                    Cmaj7       Am
And sometimes I feel like I can't go on living

Am
There's not much to take when you've done all the giving

F
Now you're gone

Fm
And I need you here tonight

C (hammer-on and pull-off on the D string 3rd fret with your pinky)

C  G                                 Em7
You know that I can't sleep 'cause I'm terrified

               Am                     F
Feels like I'm falling down really fast inside

G                      Em7
And I'm wishing the night away

Am7
These chills in the evening

          F          Fm
They won't go away

G                   F
And now I need to find a way

   Am                             G
To stop this pain from getting stronger

(tricky part : while playing the G  he takes his index finger,puts it on 2nd fret of the
G string quickly and then takes it off,you can hear it in the video,again it's not an
essential part of the song,sorry I wish I could explain this part better !)

 F               G                          Am                 F        Fm
And I just can't explain, I don't understand why you left me here

G Em7 Am F

C  G                               Em7
Oh you know that I can't sleep 'cause I'm terrified

               Am                     F
Feels like I'm falling down really fast inside

G                        Em7
And I'm wishing the night away

   Am7
These chills in the evening

              F       Fm
They won't go away

C Cmaj7

Am
Ohhhhh

F  Fm                           C (hammer-on and pull-off on the D string 3rd fret with
your pinkie)
     They won't go away



I hope this was clear enough,I know this gets a little confusing sometimes,but I tried
my best !