Why are spids in suspended state.

SELECT es.session_id AS session_id

,COALESCE(es.original_login_name, '') AS login_name

,COALESCE(es.host_name,'') AS hostname

,COALESCE(es.last_request_end_time,es.last_request_start_time) AS last_batch

,es.status

,COALESCE(er.blocking_session_id,0) AS blocked_by

,COALESCE(er.wait_type,'MISCELLANEOUS') AS waittype

,COALESCE(er.wait_time,0) AS waittime

,COALESCE(er.last_wait_type,'MISCELLANEOUS') AS lastwaittype

,COALESCE(er.wait_resource,'') AS waitresource

,coalesce(db_name(er.database_id),'No Info') as dbid

,COALESCE(er.command,'AWAITING COMMAND') AS cmd

,sql_text=st.text

,transaction_isolation =

    CASE es.transaction_isolation_level

    WHEN 0 THEN 'Unspecified'

    WHEN 1 THEN 'Read Uncommitted'

    WHEN 2 THEN 'Read Committed'

    WHEN 3 THEN 'Repeatable'

    WHEN 4 THEN 'Serializable'

    WHEN 5 THEN 'Snapshot'

END

,COALESCE(es.cpu_time,0)

    + COALESCE(er.cpu_time,0) AS cpu

,COALESCE(es.reads,0)

    + COALESCE(es.writes,0)

    + COALESCE(er.reads,0)

    + COALESCE(er.writes,0) AS physical_io

,COALESCE(er.open_transaction_count,-1) AS open_tran

,COALESCE(es.program_name,'') AS program_name

,es.login_time

FROM sys.dm_exec_sessions es

    LEFT OUTER JOIN sys.dm_exec_connections ec ON es.session_id = ec.session_id

    LEFT OUTER JOIN sys.dm_exec_requests er ON es.session_id = er.session_id

    LEFT OUTER JOIN sys.server_principals sp ON es.security_id = sp.sid

    LEFT OUTER JOIN sys.dm_os_tasks ota ON es.session_id = ota.session_id

    LEFT OUTER JOIN sys.dm_os_threads oth ON ota.worker_address = oth.worker_address

    CROSS APPLY sys.dm_exec_sql_text(er.sql_handle) AS st

where es.is_user_process = 1

  and es.session_id <> @@spid

ORDER BY es.session_id