Row, row, row your boat

The tune of this nursery rhyme is credited to Eliphalet Oram Lyte in the publication The Franklin Square Song Collection (1881, New York) which also indicates that he adapted the lyric:

Row, row, row your boat,
Gently down the stream.
Merrily, merrily, merrily, merrily,
Life is but a dream.

Extracted from
http://en.wikipedia.org/wiki/Row,_Row,_Row_Your_Boat:
The lyrics have often been used as a metaphor for life's difficult choices, and many see the boat as referring to one's self or a group with which one identifies. Rowing is a skillful, if tedious, practice that takes perfection but also directs the vessel. When sung as a group, the act of rowing becomes a unifier, as oars must be in sync in a rowboat.

The idea that man travels along a certain stream, suggests boundaries in the path of choices and in free will.

The third line recommends that challenges should be greeted in stride while open to joy with a smile.

The final line, life is but a dream, is perhaps the most meaningful. With a religious point of view, life and the physical planet may be regarded as having equivalent value as that of a dream, such that troubles are seen in the context of a lesser reality once one has awakened. Conversely, the line can just as equally convey nihilist sentiments on the meaninglessness of man's actions. The line is also commonly sung as "life is like a dream" rather than "life is but a dream", possibly to sound happier, less meaningful, and more appropriate for its audience of young children.

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The last line of the song strikes me few days ago – “Life is but a dream.”
I asked myself –
“When can I get out of this nightmare?”
“When is this nightmare going to end?”