As an ex-soldier I just had to chip in here to comment that soldiers sleep ANYWHERE and through the most extremes of conditions. The only problem for those guys would have been toileting. Being a soldier and sleeping in the parking garage would have been luxury accommodation ..... except for not having adequate toilet facilities. Ahh, the days of sleeping way out in the wilderness on reconnaissance exersizes in the freezing cold of winter and of sleeping in the back of trucks whilst bouncing down rugged unpaved roads way out in the wap waps.
2 Timothy 2 Authorized (King James) Version (AKJV)
1 Thou therefore, my son, be strong in the grace that is in Christ Jesus. 2 And the things that thou hast heard of me among many witnesses, the same commit thou to faithful men, who shall be able to teach others also. 3 Thou therefore endure hardness, as a good soldier of Jesus Christ. 4 No man that warreth entangleth himself with the affairs of this life; that he may please him who hath chosen him to be a soldier.
I just had to throw that bit of scripture in.