It seems a shame to me that a song as cool as the full version of "Sleepy Head" doesn't seem to have an English translation, so I decided to try to at least find romanji. And I succeeded. Mostly.

Kore wa riso janai
Nerau GOAL janai
Jibun rashiku monai
Iiya so janai

Fukanzen na koi o shite
Shizu n de iku
Sleepy Head
Futtobashitai

Tada no gisei janai
Karui GAME janai
Jibun rashiku monai
Nana nana so janai (This part was missing on AnimeLyrics.com, so I took a stab at filling them in here.)

Fukenzen na koi o shite
Sae wataru
Sleepy Head
Futtobashitai

Mado no soto o miteru
Kareta niji o miteru
Niawanaku monai
Yes, I'm Sleepy Head

Fukanzen na koi o shite shizu n de iku
Fukenzen na koi o shite sae wataru
This is my head
Futtobashitai

This is what I found on AnimeLyrics.com. Could someone please translate this into English? Also, does anyone know the correct composition of that one line? Thanks in advance.