Day-time elements that are keeped in dreams

Has anyone here reflected on what links daily time events or thought to their coming-back in dreams? I guess mind in dream is very selective but I can't understand on what she base her choices...

e.g.
Yesterday I've spoked about a lot of things with a lot of people: about work, womans, politicians, history, science, travels, dreams & so on...

The only element that was kept in my dream was Mexico of whom I was speaking with a friend

I hope to have been clear... -_-

I've got that all the time. Yesterday I've watched Desperado with Antonio Banderas and Salma Hayek and this morning I had a LD in which they were sitting at a table, talking. Well, actually Hugh Grat sat there instead of Antonio Banderas, but when I saw him I thought it was Antonio Banderas.