This tab only uses basic chords: Am, C, F, and G.
Capo on 2nd fret!!!
Standard Tuning
If you have any questions or doubts about the chords and/or strumming pattern or 
anything else, you can watch this and I'm sure it will help you:
http://www.youtube.com/watch?v=eKqMANT5CZQ

Chords:
   Am     C     F    G
e|--0-----0-----x----1-----|
B|--1-----1-----x----0-----|
G|--2-----0-----2----0-----|
D|--2-----2-----3----0-----|
A|--0-----3-----3----2-----|
E|--x-----x-----1----3-----|

Intro: (Figure out the strumming pattern)


e|--0-----0-----x----1-2---|
B|--1-----1-----x----0-0---|
G|--2-----0-----2----0-0---|
D|--2-----2-----3----0-0---|
A|--0-----3-----3----2-3---|
E|--x-----x-----1----3-4---|

Verse: "Well I never took a shortcut out..."


e|--0-----0-----1----x-----|
B|--1-----1-----0----x-----|
G|--2-----0-----0----2-----|
D|--2-----2-----0----3-----|
A|--0-----3-----2----3-----|
E|--x-----x-----3----1-----|

Chorus: "These days are keeping me up at night..."

                             The 4th time you play this instead of Am.
e|--x-----0-----1----0-----|--2--|
B|--x-----1-----0----1-----|--0--|
G|--2-----0-----0----2-----|--0--|
D|--3-----2-----0----2-----|--0--|
A|--3-----3-----2----0-----|--3--|
E|--1-----x-----3----x-----|--4--|

Play intro, verse and chorus again.

Then play:


e|--0-----0-----x---0---1-2---|
B|--1-----x-----x---1---0-0---|
G|--2-----1-----2---0---0-0---|
D|--2-----2-----3---2---0-0---|
A|--0-----2-----3---3---2-3---|
E|--x-----x-----1---x---3-4---|

Play chorus again.

Outro:


e|--0--0----0--|
B|--x--x----x--|
G|--1--1----1--|
D|--2--2----2--|
A|--2--0h2--2--|
E|--x-------x--|